Abdomen exercise machine



FIG. 1 is a perspective view of an abdomen exercise machine, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of portions of the abdomen exercise machine forms no part of the claim. 

CLAIM The ornamental design for an abdomen exercise machine, as shown and described. 